I use a DNZ GameReaper on my .270. I haven't had to worry about my scope moving during test of near Jack O'Connor level loads for hunting.
DNZ products also has their Freedom Reaper Mount that can be found in 34mm.

I don't shoot anything heavier than my .270 scoped so my information and experience are limited.

My big problem is finding a good affordable varmint scope(IE under 500 bucks). Needs to go to at least 18 power, at least 40mm, and must have target knobs(1/4" click) and ideally an adjustable objective. Redfield has a "Revenge" that goes to 18 power, but no target knobs and no adjustable objective. Frankly, if they offered their Revolution/Tac at this power, they'd sell alot of them to budget varmint shooters.

HTRN, I would tell you that you are an evil fucker, but you probably get that a lot ~ Netpackrat

Describing what HTRN does as "antics" is like describing the wreck of the Titanic as "a minor boating incident" ~ First Shirt